the 30-year-old German said that No. 69 in bold print on his black cap is not his favourite, but the reverse number of the football club ‘Hannover 96’, the non-Bundesliga Club he has been supporting for many years.

what do they mean with non-Bundesliga Club?
Probably they they mean that Kiwi already supported them when they were not yet first Bundesliga? but it is still a bit confusing...